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Cineon LOG2LIN2LOG
Ok so I read the subject of converting from Log Cineon to LIN using the Cineon converter utility effect. The problem is I need to render out the Lin files so I can do some touch ups in Photoshop. However I cannot render it out without clipping the whites to 1. Is it even possible to render out a Lin file that can then be converted back to Log without loosing any light data. Im not sure what Im doing wrong, if anything. I am using After Effects 7.0 pro and photoshop cs2 on a windows based OS. Thanks for any help.
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5 Replies
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[Alex Torres] “However I cannot render it out without clipping the whites to 1.”
Are you working in 32bpc and rendering to a 32bpc PSD?
Darby Edelen
Designer
Left Coast Digital
Santa Cruz, CA -
I am in 32 bpc and trying to render to a 16 bpc tiff ideally. 32 bpc files can be opened by Photoshop but no real work can be done on them for some reason. Selections, masking and cloning are only supported at 16 bpc. Although I have not tried a 32 bpc PSD, I tried with a 32bpc tiff and exr.
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You can also render out a 16 bit log TIFF, no Cineon Conversion. Make your own LUT in Photoshop (make a log curve in CURVES) as an adjustment layer. Paint, do work etc. Turn off the LUT and render out again.
Do some tests first. I have not done this in a few years but it always worked for me.
cheers
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[Alex Torres] “I am in 32 bpc and trying to render to a 16 bpc tiff ideally. 32 bpc files can be opened by Photoshop but no real work can be done on them for some reason.”
Many filters and adjustments are disabled in 32bpc, but it has its benefits… Namely it maintains superwhites, which is precisely what you were concerned about to begin with. If you want to preserve the information in the Log encoded Cineon files then there is no other option for you but to work in 32bpc throughout the process (including any work in Photoshop).
[Alex Torres] “Selections, masking and cloning are only supported at 16 bpc. “
What version of Photoshop are you using? I don’t remember this problem in CS2, but in CS3 I can mask layers, use the stamp tool, make selections, etc. in 32bpc. The only things that are missing are some Adjustments (Curves is the big one there) and Filters (most of which I don’t miss much).
Darby Edelen
Designer
Left Coast Digital
Santa Cruz, CA -
I am using Photoshop CS2. Unfortunatly hardly any tools are supported at 32 bit with CS2. I tried with a friend who had CS3 extended and most of the tools are avail at 32 bit, so I got a trial of CS3 but not the extended one and only some of the tools are supported much to my chagrin. As far as the adj layer idea, I though the whole problem was that the blending, compositing and paint operations mathmatically were created for use with Linear images. Doing stuff to them In Log space I thought caused odd side effects with the pixels themselves. So I dont know if working with an adjusment layer would actually help. Also I dont know how to create a Linear LUT offhand, would that be an S curve?
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